Grinding-machine



(No Model.)

P. PARSONS.

GRINDING MACHINE.

No. 570,766. Patented Nov. 3, 1896.

ws mams :1zns co, P'Norourho.. vusuwm'on. n. c.

UNITED STATES PATENT OEEICE.

FRANK PARSONS, OF MONTGOMERY, MISSISSIPPI.

GRlNDlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 570,766, dated November3, 1896.

Application filed November 27, 1895. Serial No. 570,270. (No model.)

To all whom, it may concern:

Be it known that I, FRANK PARSONS, of Montgomery, in the county ofLincoln and State of Mississippnhave invented certain new and usefulImprovements in Grinding- Machines, of which the following is a full,clear, and exact description.

This invention relates to certain improvements in grinding-machines, andespecially that class of such machines designed and adapted for grindingand sharpening the cutter-heads of planing-machines; and the object ofthe invention is to provide a device of this character of a simple andinexpensive construction adapted to grind such cutterheads in an evenand uniform manner, whereby an important economy lin time and labor maybe effected.

The invention consists in a machine comprising an adjustable slidingcarrier adapted to hold the cutter-head to be ground, means foractuating said carrier, and a grind-wheel adjacent to the carrierand-adapted to engage the cutter-head carried thereon.

The invention also contemplates certain novel features of theconstruction, combination, and arrangement of the various parts of thedevice, whereby certain importantadvantages are attained and the deviceis made simpler, less expensive, and otherwise better adapted and moreconvenient for use than various other similar devices heretoforeemployed, all as will be hereinafter fully set forth.

The novel features of the invention will be carefully defined in theclaims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the gures.

Figure 1 is a side elevation of the grinding.

machine, the central part thereof being shown broken away and the upperpart being shown in section. Fig. 2 is aview similar to Fig. 1, buttaken at right angles thereto. Fig. 3 is a partial plan view showing thegrind-wheel and cutter-head in position for grinding. Y Fig. 4 is a planview showing the carrier for the cutter-head. Fig. 5 is a plan viewshowing the vertically-movable table whereon the carrier is mounted, andFig. 6 is a partial side view showing the saine part.

In the views, 1 indicates a suitable support whereto thegrinding-machine'is secured, and 2 2 represent brackets bolted to saidsupport and having vertically-alined bearings at their outer ends,wherein slides a vertical shaft 3, the lower end of which is adj ustablycoupled to one end of a treadle-lever 3a, pivoted at 3b and arranged tobe operated by the foot of an attendant, so as to move the shaft 3vertically, said shaft being held normally in its lowered position bygravity.

On the upper end of shaft 3 is carried a table 4, being held on one endof an arm 5, having a socket 6 at its central portion to receive theupper end of said shaft 3, and the opposite end 7 of said arm 5 is bentand arranged to slide in a vertical guideway formed by a bracket 8,secured to the support 1, as clearly shown in Figs. 2 and 5.

The table iis of circular forln and is provided with a central socket 9,having a conical form, being tapered toward its lower-end, and in saidsocket 9 fits a conical stud or stem 10, projecting from the lower endof a guideblock 11, the under side of which is flush with the top of thetable 4.. The said table is provided with a curved slot 12, whereinplays a screw 13, set in the guide-block l1, and said screw is providedwith a nut 13, whereby when the parts are adjusted they may be securelyclamped together. To permit of accurately adjusting the guide-block onthe table, these parts are provided, as seen at 4f in Fig. 6, withgraduations formed on their edges.

The' upper part of the guide-block 11 is provided With a transverseelongated portion 14, forming a guide whereon is arranged to move aslide 15, having its edges dovetailed, as clearly seen, to engage theundercut edges of said guide 14., and on said slide is secured the`carrier 16, consisting of a plate of substantially circular flattenedform, held on said slide by means of a bolt 17, which passes throughsaid carrier and slide 15 and is provided at its upper end with a nutlSto hold the carrier in place. The carrier 16 is provided with apertures16, arranged by preference ninety degrees apart and adapted to registerwith a single aperture in the slide 15,

IOO

and said apertures 16a are adapted to be engaged by a set-screw 1Gb, asseen in Fig. 4. By this construction it is evident that the cutter-headmay be set at various angles to or parallel with the grinding-wheel,according to the angle on which the cutting edges are to be ground.

The lower end of the bolt 17 is enlarged and counterbored and arrangedto play, when the slide 15 moves along the guide 14,- in a guideway 14,formed longitudinally along the center of the upper face of said guide.The bore of said head of the bolt 17 is screw-threaded to receive ascrew 19, extending along the guideway 14n and provided with a collar19, bearing against the yoke 20, in which yoke the screw 19 is rotatablymounted. 'l he yoke 2O projects from the guide 14, and the screw 19 isprovided with a handle 21, whereby it may be conveniently turned to movethe slide 15 along the guide 14.

The carriage 16 is provided at diametrically opposite sides withstandards or posts 22, the upper ends of which carry screws or pins 23,whereon are pivoted the arms 24 of a yoke 25, having at its centralportion a stud or mandrel l2t, alined with the guide 14 and adapted tofit in the bore of the stock 27 of the cutterhead 2S, said stock beingheld in place on said mandrel by means of a set-screw 29 or the like.The yoke 25 is provided near the mandrel 26 with an adjusting-screw30 toengage the end of the stock 27, whereby it may be heldin position, theopposite end of said stock having a screw 30 toengage the end of thesaid mandrel. In this way the cutterhead may be conveniently adjusted onthe mandrel and held against movement.

At its forward side the carrier 16 is provided with an adj Listing-screw31, the upper end of which is arranged to engage under the end of thestock 27, so as to permit the angle at which the cutter-head stands tothe horizontal to be conveniently varied, the yoke 25 swinging pivotallywhen said screw 31 is adjusted, and to grind the cutters 32 of thecutter-head a grind-wheel 33 is employed, mounted on a shaft 34 abovethe carrier 16 and driven from any source of power.'

To limit the upward movement of the carrier and prevent the cutter-headfrom being damaged bythe grind-wheel, I employ a screw 35, secured tothe table 4 and depending between forks or lugs 36 on the upper bracket2, below which a nut 37 is arranged to screw on said screw 35, so as toform an adjustable stop to limit the upwardk movement of the shaft 3when actuated by the treadle-lever.

In operation the guide-block 11 is adjusted to stand at the proper angleto the table 4 to give the desired cut for the knives of thecutter-head, and said cutter-head is secured on the mandrel, as seen inFigs. 1 and 2, after which the treadle-lever 3 is depressed, so as tobring the cutter-head into engagement with the grind-wheel 33, whereuponthe screw 19 is turned to cause the slide 15 to move along the guide 14,thereby adjusting the cutting tion of my invention that the device issus ceptible of considerable modification without material departurefrom the principles and spirit of my invention, and for this reason I donot wish to be understood as limiting myself to the precise form of theparts herein set forth.

Having thus described my invention, I claim as lnew and desire to secureby Letters Patent- 1. The combination with a support, of alongitudinally-movable shaft, a treadle connected with the lower end ofthe shaft, a table carried on the shaft, a guide-block axiallyadjustable on the table, a carrier sliding on the guide-block, a yokesupported on the carrier, and a grinding-tool, substantially asdescribed.

2. The combination with a support having alined bearings, of alongitudinally-movable shaft in the bearings, a treadle connected to theshaft, a table carried on the shaft, an arm fixed to the table, a guideon the supportwith which the arm is slidably connected, a guideblockaxially adjustable on the table, a slide movable on the guide-block, ascrew carried by the guide-block and connected with the slide, a carrierfixed to the slide-.arms rising from the carrier, a yoke carried by saidarms, and a grinding-tool, substantially as described.

3. The combination with a support, of a longitudinally-movable shaft, atreadle connected with the shaft, a table carried by the shaft, acarrier supported on the table, arms rising from the carrier, a yokepivotally mounted in the arms, a mandrel on the yoke, a screw supportedon the carrier and capable of adjusting the yoke, and a grinding-tool,substantially as described.

4. The combination with av support having alined bearings,of a shaftlongitudinally movable in the bearings, a treadle, a carrier snpportedon the shaft, a grinding-tool, a screw moving with the shaft and havinga nut IXO thereon, and two lugs rigid with the support l 6. Thecombination with a support, of a rier, and a screw supported on thecarrier carrier, ayoke pivotally mounted on said carand capable ofadjusting the yoke, substanier, a mandrel carried by the yoke, and atially as described. screw supported on the carrier and capable l 5 ofadjusting the yoke, substantially as described. Vitnesses:

7. The combination with a support, of a W. E. OLIVER,

carrier, a yoke pivotally mounted on said cai- J. S. REA.

FRANK PARSONS.

